.smile
{
  width:  347px;
  height: 347px;
  animation: glowPulse-large 3s infinite ease-in-out;
}

@keyframes glowPulse-large
{
    0% { filter: drop-shadow(0 0 10px #ffcc00); }
   50% { filter: drop-shadow(0 0 30px #ffeb3b); }
  100% { filter: drop-shadow(0 0 10px #ffcc00); }
}